| DirectX SDK | 
DPMSG_SETSESSIONDESC contains information for the DPSYS_SETSESSIONDESC system message. Every player will receive this system message when the session description changes.
This messages will not be generated if the DPSESSION_NODATAMESSAGES flag is specified in the session description.
typedef struct {
    DWORD           dwType;
    DPSESSIONDESC2  dpDesc;
} DPMSG_SETSESSIONDESC, FAR *LPDPMSG_SETSESSIONDESC;
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dplay.h.